Performs bitwise AND operation between the contents of Rs0 and Rs1,
and puts the result into Rd3 according to BS (bank select). Instruction
is stack conditioned.
Takes 4 cycles to execute.
Example: IAND 0xA3 4 0xA0 0xA1
MPC BS3 C3 P3 P1 P0
--------------------
IAND 0 0 00 A1 A0
- 0 0 00 00 00
- 0 0 00 00 00
- 3 0 A3 00 00
NOT YET
IAND 0x20 3 0x22 0x21 !! Perform bitwise AND
!! between the contents
!! of registers 0x21 and
!! 0x22, then put result
!! register 0x20